Update terraform file to generate trial cluster

[rawanmahdi]

Closes #86
Followed this tutorial:
https://medium.com/the-telegraph-engineering/binding-gcp-accounts-to-gke-service-accounts-with-terraform-dfca4e81d2a0
up till the terraform plan generation. I ran the tfplan and it generated the node pools, visible on our project:

One thing I haven't yet figured out is how to share the default account key. I set it as a github secret but dk how to read that on terraform, so for now its reading a credentials.json on my local that I didnt push cause it'll start screaming at me if I do. I can share the json on discord so you guys can run it as well.

Next stepss:

• link credentials to the cluster and setup the dummy endpoints (this part of the tutorial).
• automate the terraform running through github actions: https://developer.hashicorp.com/terraform/tutorials/automation/github-actions this would mean that we wouldn't even have to run terraform apply on our local, all would take place on gh actions when we push to main